The eyes are placed high on the head and lack nictitating membranes.

The small and circular eyes are equipped with nictitating membranes.

There is also a third eyelid on each eye, the nictitating membrane.

A nictitating membrane passed in front of Kava's golden eyes.

Of themselves, the nictitating membranes slid across his eyes.

Nictitating membranes are present, but move only when the eyes are closed.

The eyes of an emu are protected by nictitating membranes.

The large eyes lack nictitating membranes, and behind them are small spiracles.

The eyes are large and black, without nictitating membranes (protective third eyelids).

Some species have a nictitating membrane for further protection.

To protect their eyes some species have nictitating membranes.

Her eyes were large and round, half shuttered by the gray nictitating membranes.

The eyes lack a nictitating membrane and are followed by tiny spiracles.

Transparent nictitating membranes slipped across her eyes, then slowly withdrew.

The eyes are covered by a nictitating membrane which allows the beaver to see underwater.

The nictitating membrane acts a sweeping wiper across the eye.

They do not appear to have eyelids, but have a nictitating membrane.

She didn't remember what a nictitating membrane was.

Cholo was quiet for a time, his own nictitating membranes dancing up and down.

Nictitating membranes eclipse a third of the Sergeant's eyes.

His eyes, half closed, were a curious, faded gray, their color suggesting a nictitating membrane.

The eyes are large and oval, with a nictitating membrane (a protective third eyelid).

Vision blurred as the nictitating membranes swept down, and blood poured over one.

The Eeiauoan opened her eyes with difficulty; the nictitating membranes were still swollen and red.

His crimson eyes blinked like a bird's, complete with separate nictitating membranes.